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                Gty的二逼妹子序列                </h1>
                <p>时间限制：80s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：28MB</p>			</div>
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                                <h3>题目描述</h3><p><div>Autumn和Bakser又在研究Gty的妹子序列了！但他们遇到了一个难题。</div>
<div></div>
<div>对于一段妹子们，他们想让你帮忙求出这之内美丽度&isin;[a,b]的妹子的美丽度的种类数。</div>
<div></div>
<div>为了方便，我们规定妹子们的美丽度全都在[1,n]中。</div>
<div></div>
<div>给定一个长度为n(1&lt;=n&lt;=100000)的正整数序列s(1&lt;=si&lt;=n)，对于m(1&lt;=m&lt;=1000000)次询问&ldquo;l,r,a,b&rdquo;，每次输出sl...sr中，权值&isin;[a,b]的权值的种类数。</div>
<p></p></p><hr/><h3>输入格式</h3><p><div>第一行包括两个整数n,m(1&lt;=n&lt;=100000,1&lt;=m&lt;=1000000),表示数列s中的元素数和询问数。</div>
<div></div>
<div>第二行包括n个整数s1...sn(1&lt;=si&lt;=n)。</div>
<div></div>
<div>接下来m行,每行包括4个整数l,r,a,b(1&lt;=l&lt;=r&lt;=n,1&lt;=a&lt;=b&lt;=n),意义见题目描述。</div>
<div></div>
<div>保证涉及的所有数在C++的int内。</div>
<div></div>
<div>保证输入合法。</div>
<p></p></p><hr/><h3>输出格式</h3><p><p>对每个询问，单独输出一行，表示sl...sr中权值&isin;[a,b]的权值的种类数。</p>
<p></p></p><hr/><h3>样例输入</h3><pre>10 10
4 4 5 1 4 1 5 1 2 1
5 9 1 2
3 4 7 9
4 4 2 5
2 3 4 7
5 10 4 4
3 9 1 1
1 4 5 9
8 9 3 3
2 2 1 6
8 9 1 4
</pre><hr/><h3>样例输出</h3><pre>2
0
0
2
1
1
1
0
1
2
</pre><hr/><h3>提示</h3><p><div>样例的部分解释：</div>
<div></div>
<div>5 9 1 2</div>
<div>子序列为4 1 5 1 2</div>
<div>在[1,2]里的权值有1,1,2，有2种，因此答案为2。</div>
<div></div>
<div>3 4 7 9</div>
<div>子序列为5 1</div>
<div>在[7,9]里的权值有5，有1种，因此答案为1。</div>
<div></div>
<div>4 4 2 5</div>
<div>子序列为1</div>
<div>没有权值在[2,5]中的，因此答案为0。</div>
<div></div>
<div>2 3 4 7</div>
<div>子序列为4 5</div>
<div>权值在[4,7]中的有4,5，因此答案为2。</div>
<div></div>
<div>建议使用输入/输出优化。</div>
<p></p></p><hr/><h3>题目来源</h3><p>没有写明来源</p>
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